and that is all that matters. >> reporter: and green knows all there is to know about the concussion symptomsb because one of the more aggressive players in the league, he has had the bell rung more times than not. >> it is how you feel, and how it affects your eyes or if tired or a headache, and there are symptoms, but i have had so many that i know what to look for. >> i have had two, and have you had more than two concussions? >> yeah, two. yeah. >> reporter: two that we know of, and it is still two too many, but it is not going to change the way that green changes the game. >> well, it is how we have played since we were kids, and it is part of the game. i don't think that that it should be reduced or taken out, because it keeps guys honest, and yeah, it is so when you get a big hit, and make a big hit, and get in the game, it is what makes you feel important.